Shock-absorber.



T. F. SCOTT.

} SHOCK ABSORBER. APPLICATION FILED AUG.9, 1912.

1,067,444, Patented July 15, 1913.

32 9 N {l1 /0 6 7 w J ,4 6

THOMAS F. SCOTT, OF EVERETT, MLASSAGI-IUSEY1TS.

- SHOCK-ABSORBER.

Specification of Letters Patent.

Patented July 15, 1913.

Application filed August 9, 1912. Serial No. 714,200.

means applicable to such shock absorbers and devices of similar nature.

The object of the invention is effectually to equalize the pressure atboth sides of a piston head or similar device.

Other objects of the invention will appear from the followingdescription.

The invention consists of a yielding pressure resisting'device incommunication with the pressure side of a second and independentlyadjustable yielding pressure resisting device. I

The invention consists still further in the plural valves independentlyadjustable and in the means for delivering pressure fluid from theescape side of one valve to the pressure side of the other valve.

The invention also consists in-such other novel features of constructionand combination of parts as shall hereinafter be more fully describedand pointed out in the claims;

Figure 1, represents a vertical sectional view of the preferred form ofthis improved pressure equalizer applied to a shock absorber cylinder.Fig. 2, represents a plan view of portions of the same. Fig. 3,represents a partial sectional view taken. on line 33'Fig. 1.

Similar reference characters designate corresponding parts throughout.

As shown in the drawings in its preferred form '5 indicates a cylinderhaving the wall 6 furnished with the channels 7 and 8 having therespective ports or openings 7' and 8' communicating with the interiorof cylinder 5. The wall 6 is furnished with the chambers 9 and 10, ofwhich chamber 9 communicates with channel 8 by means of duct 11 andchamber 10 communicates with channel 7 by duct 12 while furthercommunication between said channels 7 and 8 respectively with saidchambers 9 and 10 is afforded by the valve openings 13 and let in whichthe valves 1?) and 16 are movably seated and are pressed against theirseats by their respective springs 17 and 18, which are adjusted by thescrew plugs 19 and 20 mounted in bores of the bushings 21 and 22 screwedinto the walls of 'said chambers 9 and 10 and having the screw caps 23and 24 {yhich may form packing compression memers.

\Vithin the piston 5 is movable the piston head 25 having the piston rod26 slidable through a bearing or bore in one end of said cylinder andsaid piston rod 26 and cylinder 5 are adapted to be mounted on orconnected with two relatively movable parts or mechanisms the movementsof one or both of which it is desired to control to some extent or toresist by air or other fluid or liquid pressure medium contained withinthe cylinder 5.

With the parts in the positions shown in the drawlngs the pressure isequal through out the cylinder 5, the channels 7 and 8, the ducts 11 and12 and the chambers 9 and 10 at the relief sides of the valves 15 and16. If now the piston head he moved suddenly toward that end of cylinder5 communicating with port 7' of channel 7 the pressure will be increasedat that side of said .piston head and in channel 7 as well as in duct 12and chamber 10 so that valve 15 will yield if the pressure issufficient, against the action of its spring, thus opening a passage forthe pressure fluid into the chamber 9 whence said fluid is free to passthrough the duct 11 into channel 8 at the pressure side of valve 16. Ifon the contrary the piston head moves toward port 8 of'channel 8 thepressure medium will efl'ect the opening of valve 16 and from the reliefside of said valve w'li pass through duct 12 into channel 7 ,att 1epres- .sure side of valve 15. Valves f5 and 16. are

and ducts each leading froni one of said -valve chambers to a channelcommunicating with the valve seat of another of said valve chambers, andvalves in said seats.

2. A shock absorber comprising a series of valve seats, channelsextending from said seats and ducts leading from the relief sides ofsaid valve seats to channels at the pressure sides of other of saidvalve seats, valves movably mounted in said seats and independentlyadjustable spring pressure devices for said valves.

3. A shock absorber comprising a pair of valve chambers having valveseats, channels into which said seats open and ducts lead ing from therelief side of each valve seat to the channel opening into the other ofsaid valve seats, and spring pressed valves in said seats and adapted tobe moved by undue pressure" in said channels.

4. A shock absorber comprising a cylinder having a pair of channelscommunicating therewith, a pair of valve chambers having valve seatsopening into said channels respectively and ducts extending from therelief sides of said valve seats respectively to the pressure sides ofthe other of said valve seats, valves in said seats, springs actingagainst said valves, bushings mounted on or in said valve chambers, andscrew plugs in said bushings and bearing against said springssubstantially as described.

5. A shock absorber comprising a cylinder, and two automatic reliefvalves for controlling pressure at the respective ends of said cylinder,said valves having valve chambers and ducts leading respectively fromthe a relief sides of said valves to the pressure sides of the relatedvalves and to the respective ends of the cylinder, substantially asdescribed. I

THOMAS F. SCOTT.

Witnesses ESTHER MURPHY, C. B. HILL.

